I. It is resistant to microorganisms

II. It | vedclass

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Question

Only $V$.

In old trees, the greater part of secondary xylem is dark brown due to the deposition of organic compounds like tanins, resins, oils, gums,

Vedclass · Accepted Answer

Only $IV$

Vedclass · Answer

Only $V$.

In old trees, the greater part of secondary xylem is dark brown due to the deposition of organic compounds like tanins, resins, oils, gums, aromatic substances and essential oils in the central or innermost layers of the stem. These substances make it hard, durable and resistant to the attacks of microorganisms and insects. The region comprises dead elements with highly lignified walls and is called heart wood

$I.$ It is resistant to microorganisms

$II.$ It comprises dead elements

$III.$ It comprises highly lignified cell wall

$IV.$ It is the peripheral part

$V.$ It is dark and tough

Which of the above property doesn't belongs to heart wood?

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$I.$ It is resistant to microorganisms $II.$ It comprises dead elements $III.$ It comprises highly lignified cell wall $IV.$ It is the peripheral part $V.$ It is dark and tough Which of the above property doesn't belongs to heart wood?